Lamp-receptacle.



No. 873,104. PATBNTED DBG. 10, 1907.

J. S. STEWART. LAMP REGBPTAGLB.

APPLICATION FILED AUG. 17, 190e.

` gaben toz i M C thnnus,

f. UNITED sTATEs PATENT oEEioE.

I JAMES S. STEWART, OF NEW YORK, N. Y., ASSIGN OR TO ANNIE STEWART, OF NEW YORK, N. Y.

LAMP-BE CEPTACLE.

Specification of Letters Patent.

Patented Dec. 10, 1907.

l Application fled August 17. 1906. Serial No. 330.962.

f To all whom 'it may concern: Be it known that I, JAMES S. STEWART, a citizen of the United States, residing at the Acity of New York, in the county of New 5 York and State of New York, have invented certain new and useful Improvements in Lam -Receptacles, of which lthe following is a ful clear, and exact description.

My invention relates to lamp receptacles, A` particularly for the purpose of molding Wiring, and relates to a number of features of construction by which the receptacle is simplified and rendered more convenient to manufacture and use.

. 1'5 One of the obects of the invention is to provide a simple means for properly locating the receptacle u on the molding while it is being assemble This is an im ortant practical advantage, since it avoids the` necessity of any measurementsr special l care when the receptacles are being screwed into place. Another object of the invention is to so i 'form the porcelain base that it will receive any strain put upon'the circuit wires, thereby relieving the terminal clips to which it j would otherwise be applied.-

Still further objects are to enable the threaded shell or sleeve to be fastened to the l porcelain base by a single screw and to provide for holding the usual mica disk against accidental displacement. I also aim to make the passages in the porcelain base which receive the circuit wires, smooth and' 3 '5 continuous on their sides or walls, so that the circuit wires ma be easily drawn into .-ztight or any desire relation without any interference by sharp edges on metallicparts in the receptacle.

;l With these objects in view the invention consists in the features of construction here- L inafter described and claimed.

. In the drawings: Figure 1 is a top plan view of a receptacle embodying the prin- 4B ciples of my invention in place upon a mold- Fig. 2 is a view of the same with the j housing removed; Fi 3 is a section on the -fffjine 3-3 of Fig. 2. ii

g. 4 is a longitudinal '-'sect-ional view showing the insulating base the terminal connections.

The requirements for lamp receptacles,

ordinary circuit wires are carried in molding and it is desirable to have a receptacle which iitsupon the ordinary molding and which may be quickly fastened into its permanent relation thereon. In carrying out my invention I attain these purposes and also certain features of practical construction which render the porcelain and metallic parts more eas to manufacture and assemble.

referring to the drawings in which like parts are designated by the same reference sign, 1 indicates a lamp receptacle upon the molding 2 which has the usual groove 3 in which are laid circuit. wires 4 of any suitable or desired character.

5 indicates a cover which may be secured to the molding after the wires are in place.

The receptacle comprisesa base portion 6 anda houslng 7 which fits over the base so as to 'protect the same and give the receptacle a more ornamental appearance. The features of the housing form more particularly the subject of other applications filed by me, the present. invention relatingA morev particularly to the base 6 and its connected parts. Referring more particularly to Figs. 3, 4 and 7, it will be seen that the base 6 has a llat lower surface 8 from which, however, depend integral tongues 9 which are formed and positioned to enter the grooves 3 above men@ The side faces of the base 6 have passages 10 to receivethe circuit wires, and the forni of the base is such as to present one or more corners 11 which bite against the c ircuit wires when any longitudinal force is imposed thereon. This is unimportant feature of the invention because it avoids any undue strain on the terminal connections when the wires are being stretched or pulled into proper i'elation. The walls 12 of the passages against which the circuit wires bear, are recessed at 13 to` receive the terminal cli swhich form y having the terminal connections inset in the Walls of these passages a perfectly vsmooth continuous surface is presented to the circuit wires, al clearly shown in Fig. 4. V.limirppe'i' surface 14 of the insulating base 6 has a central rotuberance 15 thereon which is conveniently made square for a purpose hereinafter stated. 16 indicates a de ressed portion of the protuberance 15 whic 1 is adapted to receive a small metallic plate 17 which forms the central stud terminal of the lamp.

The threaded shell is indicated at 18, it being obvious that a T-H shell or sleeve could be used in lieu thereof if desired. The lower edge of the shell 18 is flanged inward as shown at 19, and apertured at 2 0 to fit' over the protuberance 15. 21 indicates a metallic clip which is also apertured at 22 to fit over the protuberance I5. The protuberance 15 cooperates in a special waywith the clip-21 so as to hold the same and the threaded shell securely'in place bythe use of only a single clamping screw. For this purpose the protuberance is notched on one of its side faces, as shown at 23, and theaperture 22 of the clip 21 is sli htly to one side of the central position so t at the I clip may be slipped over the protuberance and then moved laterally into central position, in which relation it will be ,engaged in the notch 23 of the rotuberance. 24 indicates a c amping screw which is passed upward through the base to hold the clip 22 on the side which is not secured by the notch 23. In this way the clip and the threaded shell are securely fastened to the insulatin base. The clip 21 has an extension 25 whi-c passes downward through a hole 26 in the base and into one of the assages 10 above described. The lower entf) of this extension is deflected laterally at 27, said'deiiected portion falling into the recess 13 of the 40 passage so that the upper surface of the metal and the wall of the assage lie in a continuus unbroken curved surface. In the o posite passage there is contained a clip 28 aving a laterally deiiected portion 29 similar to 5145 the part 27 of the clip 25, and received in the corres onding recess 13 of the other passage 10. heupper end of the clip 28 is received in a cavity 30 in the base and is securely fastened therein by a screw 31 which is passed downward through the late 17 above men tioned. This screw e orms the triple function of holding the plate 17 and the clip 28 in place and establishing an electrical connection between them. 32 indicates terminal screws which are rceeived in the clips 25 and 28 so as to establish connection with the circuit wires. The base is recessed at 33 so as to accommodate these. screws. The base is also provided l .with holes 34 through which screws may be passed to secure the base in its osition on a molding.' The housing 7 inay tlfen be placed over the base, resting on ledges 35'thereon, and an insulating Abushing 36 screwed upon 'the sheligso as tp the housing in place.

From the foregoing it will be seen that when the circuit wires are properly connected beneath the terminal screws 32-` the plate 17 and the shell 18, which are in direct electrical connection with the two clips, will be charged to the circuit potential difference. The metallic parts of opposite polarity are, however, separated by a'wall or partition of porcelain at every point so that there is no' danger of an arc or short-circuit and the insurance regulations are fullyr complied with.

As an additional precaution against shortcircuit I insert in some cases a mica disk 37 which has a centrai hole 38 corresponding in form to the shape of the protuberances 15 80 but slightly smaller. The mica disk is slitted at 39 in radial directions from said aperture 38 so that when the mica is forced over the protuberance, the inside edges will bev pressed upward, as clearly shown in Fig. 4. As mica 1s a resilient material, these edges act to frictionally bite the side faces of the protuberance, so that the mica disk will not thereafter be displaced without special tools or manipulation.

Having described my invention, I claim 1. In an electrical appliance adapted to bepositioned on a molding having longitudinal grooves, an insulating base having a fiat lower surface with an integral elongated tongue thereon and projecting from said lower surface of the base intermediate the' side edges thereof, said tongue beinff'adapted to enter one of the grooves of said molding whereby the base is properly positioned on 10) the molding when said tongue 'enters such groove thereof.

2. In an electrical appliance adapted to be positioned 0n a molding havin longitudinal grooves, an insulating base having a fiat 105 lower surface with a plurality of. parallel elongated tongues projecting from said lower surface of the base intermediate the side edges thereof, said tongues being adapted to enter the ooves of said molding, whereby the base 1s properly positioned on the molding when said tongues enter the grooves thereof.

3. In an electrical appliance adapted to be positioned on a molding having circuit wires, an insulating base having a fiat lower face, and having passages 'to receive the circuit wires, sai( passages leading upward from said fiat lower face so as to produce edges or corners 1], and which are adapted to bear 120 I against the said circuit wires.

4. In an electrical appliance of the class described, an insulating base having a rotuberance, one side face of which is notc ed,

a shell or sleeve apertured to t over said rotuberance, a clip having a hole adapte to fit over said protuberance and laterally displaced to enter said notch, and means for additionally holdin said clip against the shell,

whereby the she is secured m place. 33D

' the `she1l, a'nd a mica. disk aperturedhto A JAMES -S' STEWART' f 5 clsely t said protuberance and slitted so as Witnesses: to frictionally engage the same against With- FRANK S. (3mm,v

drawal. Y WALno M. CHmN.

' 45.` In an lectrical applianc of the Class 'In wlfita'ies whereo'l subscribe-my signa. g desci'ibed, an insulating base, a. shell; said ture, in the presence of two witnesses.

5 base having a protuberance ,projecting into 

